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                <h2 id="sql-server行转列"><a href="#sql-server行转列" class="headerlink" title="sql server行转列"></a>sql server行转列</h2><p>类似MySQL group_concat()使用stuff()。stuff()将字符串插入到另一个字符串中。它从第一个字符串的开始位置删除指定长度的字符；然后将第二个字符串插入到第一个字符串的开始位置。</p>
<pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">select</span> stuff<span class="token punctuation">(</span><span class="token string">'ABCDEFG'</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">,</span><span class="token string">''</span>hijk<span class="token punctuation">)</span> <span class="token operator">=</span> AhijkEFG
<span class="token keyword">SELECT</span> id<span class="token punctuation">,</span> <span class="token keyword">value</span> <span class="token operator">=</span> stuff<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">SELECT</span> <span class="token string">','</span> <span class="token operator">+</span> <span class="token keyword">value</span> <span class="token keyword">FROM</span> <span class="token keyword">temp</span> t <span class="token keyword">WHERE</span> t<span class="token punctuation">.</span>id <span class="token operator">=</span> <span class="token keyword">temp</span><span class="token punctuation">.</span>id <span class="token keyword">FOR</span> xml path<span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token string">''</span><span class="token punctuation">)</span> <span class="token keyword">FROM</span> <span class="token keyword">temp</span> <span class="token keyword">GROUP</span> <span class="token keyword">BY</span> id

<span class="token comment">-- 实例</span>
<span class="token keyword">SELECT</span> t<span class="token punctuation">.</span>unit_id<span class="token punctuation">,</span>t<span class="token punctuation">.</span>value_param<span class="token punctuation">,</span>t<span class="token punctuation">.</span>code_param<span class="token punctuation">,</span>conf<span class="token punctuation">.</span>state
<span class="token keyword">FROM</span>
<span class="token punctuation">(</span><span class="token keyword">SELECT</span> 
unit_id<span class="token punctuation">,</span>
STUFF<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">SELECT</span> <span class="token string">','</span> <span class="token operator">+</span> val1 <span class="token keyword">FROM</span> gs_pss_config b <span class="token keyword">WHERE</span> b<span class="token punctuation">.</span>unit_id <span class="token operator">=</span> a<span class="token punctuation">.</span>unit_id <span class="token operator">AND</span> b<span class="token punctuation">.</span>conf_type <span class="token operator">=</span> <span class="token comment">#&#123;conf_type&#125; FOR xml path('')),1,1,'')AS value_param,</span>
STUFF<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">SELECT</span> <span class="token string">','</span> <span class="token operator">+</span> param_code <span class="token keyword">FROM</span>	gs_pss_config c	<span class="token keyword">WHERE</span> c<span class="token punctuation">.</span>unit_id <span class="token operator">=</span> a<span class="token punctuation">.</span>unit_id	<span class="token operator">AND</span> c<span class="token punctuation">.</span>conf_type <span class="token operator">=</span> <span class="token comment">#&#123;conf_type&#125; FOR xml path('')),1,1,'')AS code_param</span>
<span class="token keyword">FROM</span>
gs_pss_config a
<span class="token keyword">WHERE</span> a<span class="token punctuation">.</span>conf_type <span class="token operator">=</span> <span class="token comment">#&#123;conf_type&#125; GROUP BY a.unit_id)t</span>
<span class="token keyword">LEFT</span> <span class="token keyword">JOIN</span> 
gs_yctp_unit_config conf <span class="token keyword">on</span> t<span class="token punctuation">.</span>unit_id <span class="token operator">=</span> conf<span class="token punctuation">.</span>unit_id <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


<h2 id="统计数据考核密度"><a href="#统计数据考核密度" class="headerlink" title="统计数据考核密度"></a>统计数据考核密度</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">select</span> s<span class="token punctuation">.</span>real_tag<span class="token punctuation">,</span>s<span class="token punctuation">.</span>tag_name<span class="token punctuation">,</span>s<span class="token punctuation">.</span>unit_id<span class="token punctuation">,</span>
<span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">case</span> <span class="token keyword">when</span> s<span class="token punctuation">.</span>density <span class="token operator">=</span> <span class="token number">0</span> <span class="token keyword">then</span> <span class="token number">1</span> <span class="token keyword">else</span> <span class="token number">0</span> <span class="token keyword">end</span> <span class="token punctuation">)</span> <span class="token keyword">as</span> density0<span class="token punctuation">,</span>
<span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">case</span> <span class="token keyword">when</span> s<span class="token punctuation">.</span>density <span class="token operator">></span> <span class="token number">0</span> <span class="token operator">and</span> s<span class="token punctuation">.</span>density <span class="token operator">&lt;=</span><span class="token number">20</span> <span class="token keyword">then</span> <span class="token number">1</span> <span class="token keyword">else</span> <span class="token number">0</span> <span class="token keyword">end</span> <span class="token punctuation">)</span> <span class="token keyword">as</span> density20<span class="token punctuation">,</span>
<span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">case</span> <span class="token keyword">when</span> s<span class="token punctuation">.</span>density <span class="token operator">></span> <span class="token number">20</span> <span class="token operator">and</span> s<span class="token punctuation">.</span>density <span class="token operator">&lt;=</span><span class="token number">50</span> <span class="token keyword">then</span> <span class="token number">1</span> <span class="token keyword">else</span> <span class="token number">0</span> <span class="token keyword">end</span> <span class="token punctuation">)</span> <span class="token keyword">as</span> density50<span class="token punctuation">,</span>
<span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">case</span> <span class="token keyword">when</span> s<span class="token punctuation">.</span>density <span class="token operator">></span> <span class="token number">50</span> <span class="token operator">and</span> s<span class="token punctuation">.</span>density <span class="token operator">&lt;=</span><span class="token number">70</span> <span class="token keyword">then</span> <span class="token number">1</span> <span class="token keyword">else</span> <span class="token number">0</span> <span class="token keyword">end</span> <span class="token punctuation">)</span> <span class="token keyword">as</span> density70<span class="token punctuation">,</span>
<span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">case</span> <span class="token keyword">when</span> s<span class="token punctuation">.</span>density <span class="token operator">></span> <span class="token number">70</span> <span class="token operator">and</span> s<span class="token punctuation">.</span>density <span class="token operator">&lt;</span> <span class="token number">100</span> <span class="token keyword">then</span> <span class="token number">1</span> <span class="token keyword">else</span> <span class="token number">0</span> <span class="token keyword">end</span> <span class="token punctuation">)</span> <span class="token keyword">as</span> density99<span class="token punctuation">,</span>
<span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">case</span> <span class="token keyword">when</span> s<span class="token punctuation">.</span>density <span class="token operator">&lt;=</span><span class="token number">100</span> <span class="token keyword">then</span> <span class="token number">1</span> <span class="token keyword">else</span> <span class="token number">0</span> <span class="token keyword">end</span> <span class="token punctuation">)</span> <span class="token keyword">as</span> density100
<span class="token keyword">from</span>
<span class="token punctuation">(</span><span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> gs_job_density <span class="token keyword">where</span> <span class="token number">1</span> <span class="token operator">=</span><span class="token number">1</span> <span class="token operator">and</span> start_time <span class="token operator">>=</span><span class="token comment">#&#123;start_time&#125; and end_time &lt;=#&#123;end_time&#125;) s</span>
<span class="token keyword">group</span> <span class="token keyword">by</span> s<span class="token punctuation">.</span>real_tag<span class="token punctuation">,</span>s<span class="token punctuation">.</span>tag_name<span class="token punctuation">,</span>s<span class="token punctuation">.</span>unit_id <span class="token keyword">having</span> <span class="token number">1</span> <span class="token operator">=</span><span class="token number">1</span> <span class="token operator">and</span> charindex<span class="token punctuation">(</span><span class="token comment">#&#123;real_tag&#125;,real_tag)>0</span>
<span class="token keyword">order</span> <span class="token keyword">by</span> s<span class="token punctuation">.</span>unit_id <span class="token keyword">desc</span>
<span class="token keyword">OFFSET</span> $&#123;<span class="token keyword">start</span>&#125; <span class="token keyword">ROW</span> <span class="token keyword">FETCH</span> <span class="token keyword">NEXT</span> $&#123;<span class="token keyword">limit</span>&#125; <span class="token keyword">rows</span> only<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="批量添加-x2F-更新"><a href="#批量添加-x2F-更新" class="headerlink" title="批量添加&#x2F;更新"></a>批量添加&#x2F;更新</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">insert</span> <span class="token keyword">into</span> tbl<span class="token punctuation">(</span>a<span class="token punctuation">,</span>b<span class="token punctuation">)</span> <span class="token keyword">values</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">,</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">update</span> gs_job_pfr_mx <span class="token keyword">SET</span> val <span class="token operator">=</span> 
<span class="token keyword">CASE</span> tag_code
<span class="token keyword">WHEN</span> <span class="token string">'cals.GD_SH05_UUB00W0101Y'</span> <span class="token keyword">THEN</span> <span class="token string">'1.0'</span>
<span class="token keyword">WHEN</span> <span class="token string">'cals.GD_SH05_UUB00W0102Y'</span> <span class="token keyword">THEN</span> <span class="token string">'1.1'</span>
<span class="token keyword">WHEN</span> <span class="token string">'cals.GD_SH05_UUB00W0101D'</span> <span class="token keyword">THEN</span> <span class="token string">'1.2'</span>
<span class="token keyword">WHEN</span> <span class="token string">'cals.GD_SH05_UUB00W0102D'</span> <span class="token keyword">THEN</span> <span class="token string">'1.3'</span>
<span class="token keyword">END</span><span class="token punctuation">,</span>
<span class="token keyword">TIME</span> <span class="token operator">=</span> GETDATE<span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">WHERE</span> tag_code <span class="token operator">IN</span><span class="token punctuation">(</span><span class="token string">'cals.GD_SH05_UUB00W0101Y'</span><span class="token punctuation">,</span> <span class="token string">'cals.GD_SH05_UUB00W0102Y'</span><span class="token punctuation">,</span> <span class="token string">'cals.GD_SH05_UUB00W0101D'</span><span class="token punctuation">,</span> <span class="token string">'cals.GD_SH05_UUB00W0102D'</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="分组排序"><a href="#分组排序" class="headerlink" title="分组排序"></a>分组排序</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">select</span> row_number<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">over</span><span class="token punctuation">(</span><span class="token keyword">partition</span> <span class="token keyword">BY</span> 分组字段 <span class="token keyword">order</span> <span class="token keyword">by</span> 排序字段<span class="token punctuation">)</span> <span class="token keyword">as</span> rowNums<span class="token punctuation">,</span><span class="token operator">*</span> <span class="token keyword">from</span> 表名

<span class="token comment">-- 例：需要筛选两条数据，一条是每个区间段所有数据中最大的，另外一条是个数*10%的数值</span>
<span class="token keyword">select</span>
c<span class="token punctuation">.</span>count<span class="token punctuation">,</span>c<span class="token punctuation">.</span>maxfhl<span class="token punctuation">,</span>c<span class="token punctuation">.</span>qjd<span class="token punctuation">,</span>c<span class="token punctuation">.</span><span class="token keyword">type</span><span class="token punctuation">,</span>b<span class="token punctuation">.</span>rownum<span class="token punctuation">,</span>b<span class="token punctuation">.</span>tag_name<span class="token punctuation">,</span>b<span class="token punctuation">.</span>fhl
<span class="token keyword">from</span>
<span class="token punctuation">(</span><span class="token keyword">select</span> <span class="token function">count</span><span class="token punctuation">(</span>qjd<span class="token punctuation">)</span> <span class="token keyword">as</span> count<span class="token punctuation">,</span><span class="token function">max</span><span class="token punctuation">(</span>fhl<span class="token punctuation">)</span> <span class="token keyword">as</span> maxfhl<span class="token punctuation">,</span>qjd<span class="token punctuation">,</span><span class="token keyword">type</span> <span class="token keyword">from</span> gs_job_grade2 <span class="token keyword">where</span> tag_name <span class="token operator">=</span> <span class="token comment">#&#123;tag_name&#125; GROUP BY qjd,type)c</span>
<span class="token keyword">join</span>
<span class="token punctuation">(</span><span class="token keyword">select</span> row_number<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">over</span><span class="token punctuation">(</span><span class="token keyword">partition</span> <span class="token keyword">BY</span> qjd<span class="token punctuation">,</span><span class="token keyword">type</span> <span class="token keyword">order</span> <span class="token keyword">by</span> fhl <span class="token keyword">desc</span><span class="token punctuation">)</span> <span class="token keyword">as</span> rownum<span class="token punctuation">,</span><span class="token operator">*</span> <span class="token keyword">from</span> gs_job_grade2
<span class="token keyword">where</span> tag_name <span class="token operator">=</span> <span class="token comment">#&#123;tag_name&#125;) b</span>
<span class="token keyword">on</span> c<span class="token punctuation">.</span>qjd <span class="token operator">=</span> b<span class="token punctuation">.</span>qjd <span class="token operator">and</span> c<span class="token punctuation">.</span><span class="token keyword">type</span> <span class="token operator">=</span> b<span class="token punctuation">.</span><span class="token keyword">type</span>
<span class="token keyword">where</span> b<span class="token punctuation">.</span>rownum <span class="token operator">=</span> CEILING<span class="token punctuation">(</span>c<span class="token punctuation">.</span>count<span class="token operator">*</span><span class="token number">0.1</span><span class="token punctuation">)</span> <span class="token operator">and</span> c<span class="token punctuation">.</span><span class="token keyword">type</span> <span class="token operator">=</span> <span class="token comment">#&#123;type&#125; and c.qjd = #&#123;qjd&#125;</span>
<span class="token keyword">order</span> <span class="token keyword">by</span> c<span class="token punctuation">.</span>qjd<span class="token punctuation">,</span>c<span class="token punctuation">.</span><span class="token keyword">type</span>

<span class="token comment">-- 排序时添加序号列</span>
<span class="token keyword">select</span> ROW_NUMBER<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token keyword">OVER</span><span class="token punctuation">(</span><span class="token keyword">ORDER</span> <span class="token keyword">BY</span> 用来排序的列的列名<span class="token punctuation">)</span><span class="token punctuation">,</span>XXX<span class="token punctuation">,</span>XXX <span class="token keyword">from</span> XXX<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


<h2 id="差集、交集"><a href="#差集、交集" class="headerlink" title="差集、交集"></a>差集、交集</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token comment">-- 取差集</span>
<span class="token keyword">select</span> Name <span class="token keyword">from</span> Person1
<span class="token keyword">except</span>
<span class="token keyword">select</span> Name <span class="token keyword">from</span> Person2

<span class="token comment">-- 取交集</span>
<span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> Person1
<span class="token keyword">InterSect</span>
<span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> Person2<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


<h2 id="函数"><a href="#函数" class="headerlink" title="函数"></a>函数</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql">floor<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment">-- 返回小于或等于所给数字表达式的最大整数</span>
floor<span class="token punctuation">(</span><span class="token number">1.1</span><span class="token punctuation">)</span><span class="token operator">=</span><span class="token number">1</span> floor<span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token operator">=</span><span class="token number">2</span>

ceiling<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment">-- 返回大于或等于所给数字表达式的最小整数。</span>
ceiling<span class="token punctuation">(</span><span class="token number">1.1</span><span class="token punctuation">)</span><span class="token operator">=</span><span class="token number">2</span> ceiling<span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token operator">=</span><span class="token number">2</span>

<span class="token function">round</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment">-- 四舍五入</span>

substring<span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">select</span> substring<span class="token punctuation">(</span><span class="token string">'abdcsef'</span><span class="token punctuation">,</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">)</span> abd

reverse<span class="token punctuation">(</span>express<span class="token punctuation">)</span> <span class="token comment">-- 将字符串从尾部到头部排序</span>

charindex<span class="token punctuation">(</span>expression1<span class="token punctuation">,</span>expression2<span class="token punctuation">[</span><span class="token punctuation">,</span>start_location<span class="token punctuation">]</span><span class="token punctuation">)</span>获取某字符第一次出现的位置
expression1 必需 <span class="token comment">---要查找的子字符串</span>
expression2 必需 <span class="token comment">---父字符串</span>
start_location 可选 <span class="token comment">---指定从父字符串开始查找的位置，默认位置从1开始</span>
charindex<span class="token punctuation">(</span><span class="token comment">#&#123;tag_name&#125;,table.tagname)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="SQL关联更新"><a href="#SQL关联更新" class="headerlink" title="SQL关联更新"></a>SQL关联更新</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token comment">-- SQL关联使用聚合函数更新sql存在更新不存在添加</span>

<span class="token keyword">if</span> <span class="token keyword">exists</span> <span class="token punctuation">(</span><span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> dbo<span class="token punctuation">.</span>users s <span class="token keyword">where</span> s<span class="token punctuation">.</span>name<span class="token operator">=</span><span class="token string">'张三'</span><span class="token punctuation">)</span>
<span class="token keyword">update</span> users <span class="token keyword">set</span> sex<span class="token operator">=</span><span class="token string">'男'</span> <span class="token keyword">where</span> name <span class="token operator">=</span> <span class="token string">'张三'</span>
<span class="token keyword">ELSE</span>
<span class="token keyword">insert</span> <span class="token keyword">into</span> users <span class="token punctuation">(</span>name<span class="token punctuation">,</span>sex<span class="token punctuation">)</span> <span class="token keyword">values</span> <span class="token punctuation">(</span><span class="token string">'张三'</span><span class="token punctuation">,</span><span class="token string">'女'</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="转换数据类型的两种方式"><a href="#转换数据类型的两种方式" class="headerlink" title="转换数据类型的两种方式"></a>转换数据类型的两种方式</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> TableName <span class="token keyword">order</span> <span class="token keyword">by</span> cast<span class="token punctuation">(</span>colName <span class="token keyword">as</span> <span class="token keyword">int</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> TableName <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">convert</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token punctuation">,</span>colName<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<h2 id="树形查询"><a href="#树形查询" class="headerlink" title="树形查询"></a>树形查询</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">with</span> cte_child<span class="token punctuation">(</span>id<span class="token punctuation">,</span>areaName<span class="token punctuation">,</span>pid<span class="token punctuation">,</span><span class="token keyword">level</span><span class="token punctuation">)</span>
<span class="token keyword">as</span>
<span class="token punctuation">(</span>
 <span class="token comment">--起始条件</span>
<span class="token keyword">select</span> id<span class="token punctuation">,</span>areaName<span class="token punctuation">,</span>pid<span class="token punctuation">,</span><span class="token number">0</span> <span class="token keyword">as</span> <span class="token keyword">level</span> <span class="token keyword">from</span> erp_area <span class="token keyword">where</span> id <span class="token operator">=</span> <span class="token number">1</span> <span class="token comment">-- 优先列出第一节点查询条件或子节点查询条件</span>

<span class="token keyword">union</span> <span class="token keyword">all</span>
<span class="token comment">--递归条件</span>
<span class="token keyword">select</span> a<span class="token punctuation">.</span>id<span class="token punctuation">,</span>a<span class="token punctuation">.</span>areaName<span class="token punctuation">,</span>a<span class="token punctuation">.</span>pid<span class="token punctuation">,</span>b<span class="token punctuation">.</span><span class="token keyword">level</span><span class="token operator">+</span><span class="token number">1</span> <span class="token keyword">from</span> erp_area a
<span class="token keyword">inner</span> <span class="token keyword">join</span> cte_child b
<span class="token keyword">on</span> a<span class="token punctuation">.</span>pid<span class="token operator">=</span>b<span class="token punctuation">.</span>id
<span class="token punctuation">)</span>
<span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> cte_child <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="将文件中的数据插入数据库"><a href="#将文件中的数据插入数据库" class="headerlink" title="将文件中的数据插入数据库"></a>将文件中的数据插入数据库</h2><pre class="line-numbers language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">BULK</span> <span class="token keyword">INSERT</span>  <span class="token punctuation">[</span> schema_name <span class="token punctuation">]</span> <span class="token punctuation">.</span> <span class="token punctuation">[</span> table_name <span class="token punctuation">]</span>
<span class="token keyword">FROM</span> <span class="token string">'data_file'</span>
<span class="token punctuation">[</span> <span class="token keyword">WITH</span> <span class="token punctuation">(</span>Arguments<span class="token punctuation">)</span><span class="token punctuation">]</span>

<span class="token comment">-- 例</span>
<span class="token keyword">bulk</span> <span class="token keyword">insert</span> dbo<span class="token punctuation">.</span>tablename
<span class="token keyword">from</span> <span class="token string">'D:\abc.txt'</span>
<span class="token keyword">WITH</span><span class="token punctuation">(</span>
    FIELDTERMINATOR <span class="token operator">=</span> <span class="token string">','</span><span class="token punctuation">,</span>
    ROWTERMINATOR <span class="token operator">=</span> <span class="token string">'\n'</span><span class="token punctuation">,</span>
    DATAFILETYPE <span class="token operator">=</span><span class="token string">'widechar'</span><span class="token punctuation">,</span>
    KEEPNULLS
<span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p><strong>Arguments</strong></p>
<ul>
<li>data_file：指定数据文件的full path，bulk insert命令将数据从该文件导入到Target Table中</li>
<li>ROWTERMINATOR &#x3D; ‘row_terminator’： 指定分隔行的字符，使用该字符来分割行（Row）</li>
<li>FIELDTERMINATOR &#x3D; ‘field_terminator’：指定分隔字段的字符，使用该字符来分割字段（Field或Column）</li>
<li>DATAFILETYPE &#x3D; { ‘char’ | ‘native’| ‘widechar’ | ‘widenative’ }：指定data file编码（Encoding）的类型，推荐使用widechar编码</li>
<li>CODEPAGE &#x3D; { ‘ACP’ | ‘OEM’ | ‘RAW’ | ‘code_page’ }：如果data file中含有单字节（char或varchar）字符数据，使用CodePage参数指定字符列的CodePage</li>
<li>BATCHSIZE &#x3D; batch_size：指定一个batch包含的数据行数量，在将数据复制到Table中时，每一个Batch作为一个单独的事务，如果一个batch复制失败，那么事务回滚。默认情况下，data file中的所有数据作为一个batch</li>
<li>CHECK_CONSTRAINTS：指定在执行bulk insert操作期间，必须检查插入的数据是否满足Target Table上的所有约束。如果没有指定CHECK_CONSTRAINTS选项，则所有CHECK和FOREIGN KEY约束都将被忽略，并且，在此操作之后，表上的所有约束将标记为不可信（not-trusted）</li>
<li>FIRE_TRIGGERS：指定是否启动Insert触发器，如果指定该选项，每个batch成功插入后，会执行Insert触发器；如果不指定该选项，不会执行Insert触发器</li>
<li>KEEPIDENTITY：指定将data file中的标识值插入到标识列（Identity Column）中，如果不指定KeepIdentity选项，Target Table中的ID列会自动分配唯一的标识值</li>
<li>KEEPNULLS：指定在执行bulk insert操作期间，空列（Empty Columns）应保留NULL值，而不是插入列的默认值</li>
<li>TABLOCK：指定在执行bulk insert操作期间，获取一个表级锁，持有表级锁，能够减少锁竞争(Lock Contention)，提高导入性能</li>
</ul>

                
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